protected void btnTraverseNodes_Click(object sender, EventArgs e)
{
string result = string.Empty;
ASTreeView.ASTreeNodeHandlerDelegate nodeDelegate = delegate(ASTreeViewNode node)
{
if (!node.Equals(this.astvMyTree.RootNode))
{
result += ("[NODE:]" + node.NodeText + "[PARENT-NODE:]" + node.ParentNode.NodeText + "<br />");
}
};
astvMyTree.TraverseTreeNode(this.astvMyTree.RootNode, nodeDelegate);
this.divConsole.InnerHtml += (string.Format(">>nodes traverse: <div style='padding-left:20px;'>{0}</div>", result));
}
/// <summary>
/// save the original tree nodes to session for comparison later
/// </summary>
private void SaveOriginalTreeNodes()
{
//create a hashtable to store nodes
Hashtable ht = new Hashtable();
ASTreeView.ASTreeNodeHandlerDelegate nodeDelegate = delegate(ASTreeViewNode node)
{
//skip RootNode
if (node.Equals(this.astvMyTree.RootNode))
{
return;
}
//assume NodeValue is unique
ht.Add(node.NodeValue, node);
};
astvMyTree.TraverseTreeNode(this.astvMyTree.RootNode, nodeDelegate);
//set the session
this.OriginalTreeNodes = ht;
}
/// <summary>
/// compare to the OriginalTreeNodes to find the nodes which have been changed
/// </summary>
private void ResolveTreeNodesModification()
{
//the result string
StringBuilder sb = new StringBuilder();
#region traverse all the nodes, detect new nodes, modified nodes
//traverse all the nodes, detect new nodes, modified nodes
ASTreeView.ASTreeNodeHandlerDelegate nodeDelegate = delegate(ASTreeViewNode node)
{
//skip RootNode
if (node.Equals(this.astvMyTree.RootNode))
{
return;
}
object obj = this.OriginalTreeNodes[node.NodeValue];
//if node is a new node, it can't be found in the OriginalNodes
if (obj == null)
{
sb.Append(string.Format("[NEW] Node: {0} <br />", node.NodeText));
}
else
{
ASTreeViewNode originalNode = (ASTreeViewNode)obj;
//if the node has been changed
//compare, here I just demo NodeText and ParentNodeId
if (node.NodeText != originalNode.NodeText)
{
sb.Append(string.Format("[TEXT CHANGED]NodeText changed! Original Text:{0}, New Text: {1} <br />", originalNode.NodeText, node.NodeText));
}
if (node.ParentNode.NodeValue != originalNode.ParentNode.NodeValue)
{
sb.Append(string.Format("[PARENT CHANGED]Node's parent changed! Original Parent: {0}, New Parent: {1} <br />", originalNode.ParentNode.NodeText, node.ParentNode.NodeText));
}
int oldPos = originalNode.ParentNode.IndexOf(originalNode);
int newPos = node.ParentNode.ChildNodes.IndexOf(node);
if (newPos != oldPos)
{
sb.Append(string.Format("[POSITION CHANGED]Node's position changed! Original Position: {0}, New Position: {1} <br />", oldPos, newPos));
}
}
};
//do traverse
astvMyTree.TraverseTreeNode(this.astvMyTree.RootNode, nodeDelegate);
#endregion
#region find deleted nodes
//find deleted nodes
List <string> originalNodesKeys = new List <string>();
foreach (string key in this.OriginalTreeNodes.Keys)
{
originalNodesKeys.Add(key);
}
//traverse all the nodes, detect new nodes, modified nodes
ASTreeView.ASTreeNodeHandlerDelegate nodeDeleteDelegate = delegate(ASTreeViewNode node)
{
//skip RootNode
if (node.Equals(this.astvMyTree.RootNode))
{
return;
}
if (originalNodesKeys.Contains(node.NodeValue))
{
originalNodesKeys.Remove(node.NodeValue);
}
};
//do traverse
astvMyTree.TraverseTreeNode(this.astvMyTree.RootNode, nodeDeleteDelegate);
//keys remain in the originalNodesKeys are the deleted nodes
foreach (string deletedNodeKey in originalNodesKeys)
{
sb.Append(string.Format("[NODE DELETED]Original Node: {0}<br />", deletedNodeKey));
}
#endregion
this.divConsole.InnerHtml += (string.Format(">>The following nodes have been changed: <div style='padding-left:20px;'>{0}</div>", sb.ToString()));
}
